Which of the following is obtained when dihydrogen reacts with the alkali metals at high temperature?

Hydrogen directly combines with

Electrolysis of fused sodium hydride liberates hydrogen at the

Which is the poorest reducing agent?

Consider the following statements and identify which of them are correct:
$I.$ Atomic hydrogen is obtained by applying an electric arc to hydrogen gas.
$II.$ Hydrogen gas does not reduce heated aluminum.
$III.$ Finely divided palladium absorbs a large volume of hydrogen gas.
$IV.$ The reaction of $Na$ with $C_2H_5OH$ yields pure nascent hydrogen.

Which of the following cannot be reduced by hydrogen?